package com.zjh.test;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;
/**
 * 消费者
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        //1.kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //消费者设置group
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
        //订阅主题
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));
        while (true){
            //拉取消息，每间隔一秒
            ConsumerRecords<String, String> messages = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> message : messages) {
                System.out.println(message.key());
                System.out.println(message.value());
            }
        }



    }
}
